The Air Force this week sent Congress a $4.2 billion fiscal year 2021 unfunded priorities list, which includes $1 billion for the Space Force, $1.1 billion to buy 12 F-35 Joint Strike Fighter aircraft and about $736 million for facility sustainment efforts. "These requirements continue advancing the future force we need to implement the National Defense Strategy, while minimizing the necessary risk taken to maximize our future investments within our current topline," Air Force Chief of Staff Gen. David Goldfein...